Before removing the processor board, check the following areas:
- Check for empty or low hopper
- Check to see if hopper is jammed
- Check hopper motor, gearbox, and roll pin
- Visually inspect wires and connectors to hopper plug
- If coins are jammed in the escalator hopper, remove the bent coin(s)
- If coins are doubled-up consider replacing the pinwheel, entry plate and/ or pinwheel shims
- Perform the hopper test in the self test mode, observe hopper action to isolate problem
- Verify that coins are going through the hopper optics to the coin tray, and counted correctly
If that doesn’t work, try the following steps:
- Check the Vb at the hopper plug J/P 19-8 and J/P 19-10 to J/P 19-9
- Replace the processor board with a “known good” one
- If the processor board seems bad, check eBay for replacement or repair service
- If the processor board is good, then replace the motherboard
- To repair the motherboard, use this diagram to isolate the bad trace
- If the motherboard and processor board are good, then use this diagram to test for wire continuity

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